package com.example.demo.utils;


import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
 * @desc   使用token验证用户是否登录
 * @author zm
 **/
public class TokenUtils {
    //设置过期时间
    private static final long EXPIRE_DATE=30*60*100000;
    //token秘钥
    private static final String TOKEN_SECRET = "ZCfasfhuaUUHufguGuwu2020BQWE";

    public static String token (String username,String password,Integer role ){

        String token = "";
        try {
            //过期时间
            Date date = new Date(System.currentTimeMillis()+EXPIRE_DATE);
            //秘钥及加密算法
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            //设置头部信息
            Map<String,Object> header = new HashMap<>();
            header.put("typ","JWT");
            header.put("alg","HS256");
            //携带username，password信息，生成签名
            token = JWT.create()
                    .withHeader(header)
                    .withClaim("username",username)
                    .withClaim("password",password).withExpiresAt(date)
                    .withClaim("role",role)
                    .sign(algorithm);
        }catch (Exception e){
            e.printStackTrace();
            return  null;
        }
        return token;
    }

    public static DecodedJWT verify(String token){
        /**
         * @desc   验证token，通过返回true
         * @params [token]需要校验的串
         **/
        //截取出期望的token
        String substring = token.substring(7, token.length());
//        try {
//            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
//            JWTVerifier verifier = JWT.require(algorithm).build();
//            DecodedJWT jwt = verifier.verify(substring);
//            return jwt;
//        }catch (Exception e){
//            e.printStackTrace();
//            return null;
//        }
        return JWT.require(Algorithm.HMAC256(TOKEN_SECRET)).build().verify(substring);

    }

}